When a regex is put to use, the first step is to determine the position within the target string where the search should start.

当一个正则表达式投入使用时，首先要确定目标字符串中开始搜索的位置。

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As a regex works its way through a target string, it tests whether a match can be found at each position by stepping through the components in the regex from left to right.

当一个正则表达式扫描目标字符串时，它从左到右逐个扫描正则表达式的组成部分，在每个位置上测试能不能找到一个匹配。

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If the target repository says that it should be a string, then you leave it alone.

如果目标存储库认为它应该是一个字符串，那么就不用转换它。

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Craig Kieswetter top-scored with an unbeaten 40 as England's second-string reached the target off 16.1 overs.

BBC: Rashid inspires Lions to Twenty20 win over Pakistan A

Drillers also use sensors to detect particularly promising rock intervals within the formation, and are able to move the drill string up or down, left or right as they drill through the horizontal section to target those intervals.

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